JVC TD-WS305TN A User Manual

point value
REC/PB This step must be performed after |Deck [B] 12.5 kHz level: | Normal tape.
frequency the slave oscillation adjustment. L-ch: VRB31|0+0.5 dB Adjust VRs to flatten levels of
response Record the 1 KHz and 12.5 kHz sig- | R-ch: VRB41 | higher than the | the 1kHz and 12.5 kHz signals
adjustment nals at the level of —20 dB (20 dB 1 kHz level. basically.
lower than the reference level).
Playing back the recorded signals,
adjust VRB31 and VRB41 so that
the level of the 12.5 kHz signal is
0 + 0.5 dB to the level of the 1 kHz
signal.
*7 | Recording 1) Apply a1 kHz signal to the LINE | Deck Normal: NR switch : Off
level IN terminals, record a 1 kHz sig- | L: VR106 —8 + 0.5 dBs | TAPE switch : Norma!
adjustment nal at —2U dBs input for both (L_ | R:VR206 | CrO,/Metal:
and R) channels ona normal tape. —8 +2 dBs
2) Play back the recorded part, and
adjust the recording level con-
trols so that LINE OUT terminal
level becomes —8 dBs. Then ad-
just VR106 and VR206 so that
LINE OUT terminal
comes —8 dBs.
level be-
Record a 1 kHz, -—20dBs signal
to LINE IN terminals.
Play back the recorded part.
Check the output with a distor-
tion meter to see if the value con-
forms to the standard value.
Checking
record/
playback
distortion
2
—
Checking
signal to
noise ratio in
recording/
playback
1) Record a 1 kHz, —20 dBs signal.
Stop the input by disconnecting
from the terminal to perform
non-signal recording.
Play back the recorded part. Mea-
sure the —8 dBs recording output
and the non-signal recording out-
put for comparison using an elec-
tronic voltmeter. Check to see if
the value conforms to the stand-
ard value.
2
~—
Checking
erasing
coefficient
1) Apply a 1kHz, —20 dBs signal to
the LINE IN terminals.
2) Perform recording with the signal
enhanced by 20 dB.
3) Erase a part of the recording.
4) Measure the output difference
between the erased part and non-
erased part to compare with an
electronic voltmeter.
Normal tape:
Less than 2%
CrO, tape:
Less than 3%
Metal tape:
Less than 2%
(THD)
Normal, CrO, &
Metal tapes:
More than 55dB
More than 42 dB
TD-W304BK/ -W305TNwercvercu
Be sure to perform this checking
following bias current and record-
ing level checking.
Apply an input level to LINE IN
terminals with the recording level
controls set to maximum so that
the peak level indicator reads
0 dB.
For the measurement using a
metal tape, connect a band pass
filter between the deck and the
electronic voltmeter.
Input
{1 kHz)
(1 kHz)
. Electronic
Band pa Iter
(No. 4325-1) 11
Tape deck
(recording,
erasing)

JVC TD-WS305TN A Specifications

General

Brand	JVC
Model	TD-WS305TN A
Category	Cassette Player
Language	English